opie-taskbar-images: Don't package images to machine-dependent file, instead

opie-taskbar-images: Don't package images to machine-dependent file, instead
package to separate packages for each reolution (otherwise, machine independent).
Then, some higher-level task (task-opie) will select need package for specific
machine. User still will be able to install another package fwiw, or even
multiple (for example, to have nice wallpaper across screen rotations, but
this of course will need runtime support).